875
FNCA52 TJSJ 190857
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
457 AM AST MON JAN 19 2026
DISCUSSION
A SLIGHTLY DRIER AIRMASS CONTINUES ACROSS THE AREA, RESULTING IN
RH VALUES FLUCTUATING IN THE MID-40S TO THE LOWER 50S. SURFACE
WINDS WILL REMAIN ABOVE THRESHOLD VALUES DUE TO WINDY CONDITIONS,
WITH WINDS UP TO 15 KNOTS AND GUSTY WINDS NEAR THE SOUTHERN
COASTAL PLAINS. RECENT KDBI DATA CONTINUE TO SHOW A DRIER TREND IN
AVAILABLE FUELS ACROSS THE AREA. ALTHOUGH CONDITIONS REMAIN
FAVORABLE FOR FIRE WEATHER DISPERSION, THE RISK FOR TODAY WILL
REMAIN MODERATE.
PRZ014-200900-
SOUTHEAST COASTAL PLAINS-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 30
TEMP (24H TREND) 88 (+3) 70 (-1) 88
RH % (24H TREND) 46 (-11) 90 (+3) 49
WIND 20FT/EARLY(MPH) E 18 G23 NE 13 E 19 G24
WIND 20FT/LATE(MPH) E 18 G23 NE 13 E 19 G24
MIXING HGT(FT-AGL/MSL)5690 5280
TRANSPORT WND (MPH) E 20 E 21
VENT RATE (KT-FT) 96730 95040
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-200900-
SOUTHERN HILLS-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 40
TEMP (24H TREND) 84 (+4) 67 (-2) 84
RH % (24H TREND) 56 (-10) 95 (+4) 63
WIND 20FT/EARLY(MPH) E 13 NE 14 E 16
WIND 20FT/LATE(MPH) E 13 NE 14 E 16
MIXING HGT(FT-AGL/MSL)6090 5690
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 97440 96730
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-200900-
NORTH COASTAL PLAINS-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 40
TEMP (24H TREND) 87 (+2) 69 (-2) 86
RH % (24H TREND) 59 (-4) 100 (+6) 65
WIND 20FT/EARLY(MPH) E 20 G23 E 19 E 21 G24
WIND 20FT/LATE(MPH) E 20 G23 E 19 E 21 G24
MIXING HGT(FT-AGL/MSL)5490 4800
TRANSPORT WND (MPH) E 18 E 22
VENT RATE (KT-FT) 87840 91200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-200900-
NORTHERN HILLS-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 30
TEMP (24H TREND) 85 (+1) 67 (-2) 85
RH % (24H TREND) 55 (-5) 99 (+5) 63
WIND 20FT/EARLY(MPH) E 18 E 17 E 19
WIND 20FT/LATE(MPH) E 18 E 17 E 19
MIXING HGT(FT-AGL/MSL)6480 5600
TRANSPORT WND (MPH) E 16 E 18
VENT RATE (KT-FT) 90720 89600
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-200900-
WEST COAST-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 60
TEMP (24H TREND) 87 (+1) 68 (-2) 87
RH % (24H TREND) 56 (-5) 94 (+4) 62
WIND 20FT/EARLY(MPH) E 14 E 14 E 18
WIND 20FT/LATE(MPH) E 14 E 14 E 18
MIXING HGT(FT-AGL/MSL)5220 5080
TRANSPORT WND (MPH) E 12 E 15
VENT RATE (KT-FT) 52200 66040
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-200900-
EASTERN INTERIOR-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 50
TEMP (24H TREND) 85 (+3) 68 (-2) 84
RH % (24H TREND) 61 (-6) 97 (+2) 67
WIND 20FT/EARLY(MPH) E 13 E 14 E 17
WIND 20FT/LATE(MPH) E 13 E 14 E 17
MIXING HGT(FT-AGL/MSL)6020 5330
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 96320 90610
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-200900-
LUQUILLO MOUNTAIN RANGE-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 60
TEMP (24H TREND) 79 (+3) 67 (-2) 79
RH % (24H TREND) 67 (-9) 98 (+2) 73
WIND 20FT/EARLY(MPH) E 12 E 11 E 14
WIND 20FT/LATE(MPH) E 12 E 11 E 14
MIXING HGT(FT-AGL/MSL)4790 3740
TRANSPORT WND (MPH) E 20 E 23
VENT RATE (KT-FT) 81430 74800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-200900-
CENTRAL MOUNTAIN RANGE-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 50
TEMP (24H TREND) 84 (+5) 64 (-3) 82
RH % (24H TREND) 56 (-8) 98 (+5) 64
WIND 20FT/EARLY(MPH) E 11 E 11 E 16
WIND 20FT/LATE(MPH) E 11 E 11 E 16
MIXING HGT(FT-AGL/MSL)7040 6350
TRANSPORT WND (MPH) E 13 E 15
VENT RATE (KT-FT) 77440 82550
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-200900-
CAYEY MOUNTAIN RANGE-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 40
TEMP (24H TREND) 80 (+3) 68 (-1) 80
RH % (24H TREND) 67 (-7) 97 (0) 73
WIND 20FT/EARLY(MPH) E 12 E 11 E 14
WIND 20FT/LATE(MPH) E 12 E 11 E 14
MIXING HGT(FT-AGL/MSL)5500 4340
TRANSPORT WND (MPH) E 20 E 23
VENT RATE (KT-FT) 93500 86800
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-200900-
VIEQUES-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 50
TEMP (24H TREND) 85 (+1) 73 (0) 85
RH % (24H TREND) 58 (-5) 93 (+1) 62
WIND 20FT/EARLY(MPH) E 17 G21 E 19 G23 E 19 G23
WIND 20FT/LATE(MPH) E 17 G21 E 19 G23 E 19 G23
MIXING HGT(FT-AGL/MSL)3760 3380
TRANSPORT WND (MPH) E 21 E 26
VENT RATE (KT-FT) 67680 77740
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-200900-
CULEBRA-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 40
TEMP (24H TREND) 87 (+3) 75 (-1) 85
RH % (24H TREND) 59 (-8) 90 (+3) 64
WIND 20FT/EARLY(MPH) E 17 G22 E 19 G23 E 19 G24
WIND 20FT/LATE(MPH) E 17 G22 E 19 G23 E 19 G24
MIXING HGT(FT-AGL/MSL)3750 3450
TRANSPORT WND (MPH) E 23 E 26
VENT RATE (KT-FT) 75000 79350
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-200900-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 40
TEMP (24H TREND) 89 (+4) 69 (-2) 88
RH % (24H TREND) 46 (-10) 87 (+3) 50
WIND 20FT/EARLY(MPH) E 20 G26 E 18 G23 E 23 G29
WIND 20FT/LATE(MPH) E 20 G26 E 18 G23 E 23 G29
MIXING HGT(FT-AGL/MSL)5500 5470
TRANSPORT WND (MPH) E 20 E 18
VENT RATE (KT-FT) 93500 87520
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-200900-
SAINT THOMAS AND SAINT JOHN-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 30
TEMP (24H TREND) 86 (+3) 73 (-2) 85
RH % (24H TREND) 58 (-11) 98 (+9) 64
WIND 20FT/EARLY(MPH) E 18 G22 E 19 G23 E 19 G24
WIND 20FT/LATE(MPH) E 18 G22 E 19 G23 E 19 G24
MIXING HGT(FT-AGL/MSL)3730 3500
TRANSPORT WND (MPH) E 22 E 28
VENT RATE (KT-FT) 70870 84000
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-200900-
ST CROIX-
457 AM AST MON JAN 19 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 40
TEMP (24H TREND) 87 (+3) 72 (-3) 86
RH % (24H TREND) 59 (-8) 94 (+7) 64
WIND 20FT/EARLY(MPH) E 17 G21 E 18 G21 E 19 G23
WIND 20FT/LATE(MPH) E 17 G21 E 18 G21 E 19 G23
MIXING HGT(FT-AGL/MSL)4640 4220
TRANSPORT WND (MPH) E 22 E 26
VENT RATE (KT-FT) 88160 97060
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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